MAX_PACKET_SIZE
u_int pkt[MAX_PACKET_SIZE/sizeof(u_int)+1];
len = MAX_PACKET_SIZE;
uint8_t visited[(MAX_PACKET_SIZE+7)/8];
#define QIOBUFSZ (MAX_PACKET_SIZE + MAX_RR_SIZE)
if(buffer_limit(query->packet) > MAX_PACKET_SIZE)